Archibald Beaton Gillis (January 28, 1864 – January 18, 1940) was a farmer and political figure in Saskatchewan, Canada. He represented Whitewood in the Legislative Assembly of the Northwest Territories from 1894 to 1904 as a Liberal-Conservative, and Whitewood (and then Pipestone) in the Legislative Assembly of Saskatchewan from 1905 to 1912 as a Provincial Rights (Conservative) member. Gillis sat for Saskatchewan division in the Senate of Canada from 1921 to 1940.